Cubic ice structure



FIG. 1 is a top perspective view of a cubic ice structure showing our new design;

FIG. 2 is a front elevational view thereof, the undisclosed rear being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof, the undisclosed side being a mirror image; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a cubic ice structure, as shown and described. 